Needle-bar-operating mechanism



A; H. DE VOE.

NEEDLE BAR OPERATING MECHANISM.

APPLICATION men DEC. 11, 1918.

2 SHEETS-SHEET iNVENTOR WITNESSES mflf% ATTORNE Patented Aug. 2, 1921..

A. H. DE VOE.

NEEDLE BAR OPERATING MECHANISM.

APPLICATION man use 11 I9l8 Patented Aug. 2, 1921.

2 SHEETS-SHEET 2 mm W A TORNEY UNITED STATES PATENT OFFICE.

ALBERT H. DE VOE, OF WESTFIELD, NEW JERSEY, AS SIGNO FACTURING COMPANY, A CORPORATION OF R rornn SINGER MANU- NEW JERSEY.

NEEDLE-BAR-DPERATING MECHAN ISM.

Original application filed December 31, 1915, Serial No. 69,644. Divided and thi cember 17, 1918. Serial No. 267,104.

T 0 all whom it may concern:

Be it known that I, ALBERT I-I. DE Von, a citizen of the United States, residing at lVestfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Needle-Bar- Operating Mechanisms, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to needle-bar operating mechanism for sewing machines and has particular reference to needle-bar mech-' anism in which the needle-bar may be turned axially as well as reciprocated; the mechanism herein disclosed being particularly useful in embroidering or buttonhole stitching machines having a movablestitchframe.

The invention has for an object to provide a needlebar operating mechanism of simplified construction which will be strong, durable andefiicient .in operation.

A. further object of the invention is to provide asimplifiedand improved needlebar mechanism for use in a buttonhole sewing machine having a movable stitch-frame.

Further objects of the invention will ap pear from the, following description. and claims.

The. invention preferably comprises a reciprocating needle-bar and a rotary crank disposed at opposite sides of the plane of the work-support; the crank being movable on an axis transverseto the needle-bar; the needle-bar being connected to a reciprocatory stud or slide which, in turn, is connected by a pitman with the rotary crank. In the embodiment of the invention illustrated, the needle-bar is journaled in a rotary andlongitudiT-rlly slottedbushing and is provided with a spline working in the slot of said bushing. so that the needle-bar may be rotated while it is being reciprocated The slotted bushing is sustained by an arm of a stitch-frame which is movable relative to the main frame of the machine. The rotary crank and its actuating shaft arejournaled in the stitch-frame and means are provided for transmitting rotary motion to said shaft while permitting endwise and sidewise movement of the latter with the stitch-frame.

In the accompanying drawing, Figure 1 illustrates the preferred construction of needle-bar mechanism as applied to the buttonhole sewing machine disclosed in my co- Specification of Letters Patent.

Patented Aug. 2, 1921.

s application filed Depending application Serial No. 69,644, filed December 31, 1915, of which this applicat1on 1s a division. Fig. 2 is a cross-section of the needle-bar and needle-actuating bar with their connections. Fig. 3' is a perspective view of certain parts of the latter. Figs.

and 5 are respectively a planand elevation, partly 1n section, respresenting the machine bed, the stitching frame and a portion of the feeding mechanism.

In the preferred embodiment of the invent on, as illustrated, the looper mechanism, as Well as the needle mechanism, is mounted in a traveling stitch-frame A mounted in the mainframe of the machine, as disclosed in my said copending application.

The stitch-frame A comprises the baseplate 1, having at. one end the upwardly extending cylindrical curb or casing 2 for the looper mechanism and rearward thereof the longitudinally extending bearings 3'and 4. The bearing 3 is provided with the bushin 5, and the bearing 4 has slidably fitted within it the tubular bearing boss 6 of a bracket 7 which is formed with a depending ful crum stud 8 journaled within a suitable bearing aperture in the bed-plate 9 of the main or stationary frame of the machine. The bracket 7 has secured to it by the screw 10 an arm 11 of a bearing sleeve 12 in which is journaled the tubular hub 13 of a bevel pinion 14.

The stitch-forming mechanism is driven by means of the crank-shaft 15 which is journaled in the bushing 5 and the bearing boss 6. This shaft passes through the hub 13 of the gear 141 and has secured upon its end by the set screw 16 the cross-bar 17 notched in its ends to fit the diametrically opposite and parallel guiding pins 18 formed upon the collar 19 which is secured by means of the set screw 20 upon the gear hub 13 and, with the gear 14, embraces the bearing sleeve 12 to confine the gear against axial move- J ment while the shaft 15 is permitted to move endwise freely. The collar 19 and cross-bar 17 obviously provide a sliding driving connection between the gear-hub 13 and the shaft 15. I

The bevel pinion 14 is driven by a similar pinion (not shown), carried by a suitable shaft receiving power from the main shaft of the machine, as fully described in my copending application.

Rigidly secured in a boss 21,.of the baseplate 1 is a standard 22 having secured upon its upper end the hub of an overhanging bracket-arm 23 formed at its free end with a boss 2l in which is secured-by a set-screw 25, the depending post 26 with its reducedlower portion entering an apertured bearing boss 27 sustained by the casing 2. Secured upon thepost 26 upon opposite sides ofthe boss 24 are the spaced hubs 28 of the nee dle-bar frame 29 sustaining the needle mech anism." From the foregoing it will be readily understood that the stitch frame A is free to slide over the base 9 in a direc-' tion longitudinally of the shaft 15 and may also'swin with the shaft 15 about the ful- 3'). crum-stud 8 as an axis.

' For the purposes of the present disclosure it is deemed unnecessary to describetl e connections with the-feed-wheel 3O forimparting to the stitch frame its traveling or stitch-positioning movements relative to the work as in sewing around a buttonhole.

ing 2 for'thelooper mechanism and will.

also be seen to'be mainly in front or forward of the standardi22' and the bracketarni 23. Secured upon the bar 38 is the split hubfat' one end of a rigid lateral arm 4E0 h'aving-uponits opposite end a split boss 41 loosely embracing a rotary tubular bushing 4l2 formed inone side with a longitudin'al slot 43 and journaled within bearing bosses of the needle-frame parallel with the' bar 38. The'bushing 42'is confined against 'endwise movement by acollar 4% se cured thereon below its upper bearing boss and the hub 455 of an inclined crank-arm 16 secured thereon above said bearing boss.

Journaled within the bushing 42. is the reciprocating needle-bar 47 carrying at its I lower end the needle-clamp 4:8 in an eccentrically disposed socket of which is secured by a suitable clamp-screw the eye-pointed needle 19. Fitted within the longitudinal slot l?) of the bushing 42 is a spline 50 secured to the needle-bar by screws 51 and provided upon the outerface with projecting lugs 52 embracing between them the collar 41. Through the described connections, the rotation of the crank-stud 82 with the crank-shaft 15 efl'ectsthe reciprocation of the needle-bar and needle which arecaused Y to turn with the surrounding bushing 412.

As will be observed by reference to Fig. 1, the connections. between the intermediate bar 58 and the needle-bar and the pitmanrod, respectively, are upon opposite sides of tlI QIIItQlmGCllZLtB bZLI' and extend laterally to such extent that a suflicient clearance is provided between the needle and the pitm anrod to accommodate the margin of the work in which the buttonholes are formed. P

The workis held in suitable clamps, such as disclosed in my saidcopending application, and is suppoi tedat the stitching point by the usual throat-plate or button 4:313 edly mounted on the rotary turret 44: which is journaled' within the casing '2.

fliaving thus set forththe nature of the invention, what, I claimherein is- I 1. In a se'wing machine, in'combination, a work-support,"a needleebar sustained at one side of the work-support and carrying a needle, a'rotary crankdisposed at the opposite 'side' of thework-support and movable on an axis transverse "to" said needle-bar, a with which the needle bar is connected and with which it performs 'reciprocatory movements :in unison,"and a pitman connected at its opposite ends to said trains and said studand between its ends beingfree of con'-' 7 nection with moving parts of the machine. 2. In a sewing machine, in; combination, a

work-support, a needle-bar sustained at one side of the worksupportand carrying a I needle, a reciprocatingbar disposedlaterally of and parallel; with-the needle-bar and atthe same side of the work-support", a lat. eral studand an oppositelyprojecting rigid arm 'carr ied'by saidreciprocating bar, the latter affording a driving connection with the needle{b ar, a rotary cranlg-dispos'edat the opposite side ofthe work-support and movable on an axle transverse: to'said bars,

and a pitn'ian connection'between said crank and said stud. V I 7 3. -In a sew1ngmach ne,in combination, a work-support, a'needle-bar si' stalned'at one side of the work-supportand carrying a needle, a rotary and longitudinallyslotted bushing in which said needle bar is jour naled to reciprocate, a spline uponthe nee dl'e-bar working in the slot of said bushing and provided exterior to the latter with longitudinally spaced lugs, a j reciprocating bar j ournaled in fixed bearings and disposed parallel with the needle-bar, a lateral stud and an oppositely projecting rigid carried by said reciprocating bar," the outer portion ofthe 'latterlbeing 'embraced by the spaced lugs ofthe needle-bar spline, a rotary crank disposed at the; oppositefside ofthe work support and; movable on an axis transverse tofisaid' bars, and a pitman connection between said crank and said stud.

" 4. In a sewing machine, in combination, a main frame, a, stitch fra-me movable relae tively to themain frame "and comprising a base-portion and an overhanging bracketarm, a driving shaft journaled in said baseportion, a crank on said shaft, a needle-bar journaled for reciprocation and rotation in said bracket-arm, an intermediate element connected for up and down movement in unison with the reciprocation of said needle bar, and a pitman connection between said crank and intermediate element.

5. In a sewing machine, in combination, a main frame, a stitch-frame movable relative to the main frame and comprising a base portion, an overhanging bracket-arm and a head carried at the free end of the bracket-arm, a driving shaft journaled in said base portion, a crank on said shaft, a needle-bar journaled for reciprocation and rotation in said head, an intermediate element located at the free end of the bracketarm for up and down movement in unison with the reciprocations of the needle-bar, and a pitman connection between said crank and intermediate element, said pitman connection being disposed forward of said bracket-arm.

6. In a sewing machine, in combination, a main frame, a stitch frame movable relative to said main frame and comprising a base portion, a standard and an overhanging bracket-arm carried by said standard,

a driving shaft journaled in said base-portion, a crank on said shaft disposed forwardly of said standard, a head carried at the free end of said bracket-arm, a needlebar journaled for reciprocation and rotation in said head, an intermediate element located substantially at the free end of the bracket-arm and connected to the needlebar for movement in unison with the latter, and a pitman connection forward of said standard between said crank and intermediate element.

In testimony whereof I have signed my name to this specification.

ALBERT H. DE VOE. 

